Year	Total
1985	28465000000
1986	29345000000
1987	29753000000
1988	31086000000
1989	31358000000
1990	32264000000
1991	33297000000
1992	32898000000
1993	34275000000
1994	34852000000
1995	36061000000
1996	36473000000
1997	37109000000
1998	37611000000
1999	37818000000.00001
2000	39247000000
2001	39571000000
2002	40630000000
2003	40778000000
2004	42703000000
2005	42902000000
2006	43449000000
2007	43798000000
2008	43835000000
2009	43436000000.00001
2010	44858999999.99999
2011	44418000000
2012	44321000000.00001
2013	43305000000
2014	43599000000
2015	44321000000.00001
2016	43910000000